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There are two methods, named statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute frequencies for $aLetter \oplus aLetter$ using some tool like this. A real historical example for frequency analysis is the VENOVA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has distribution $X$, the two characters behind $c_1 \oplus c_2$ with probability $P$ are $c_1$, $c_2$.

There are two methods, named statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute frequencies for $aLetter \oplus aLetter$ using some tool like this. A real historical example using frequency analysis is the VENONA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has distribution $X$, the two characters behind $c_1 \oplus c_2$ with probability $P$ are $c_1$, $c_2$.

There are two methods, named statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute Frequency for $aLetter \oplus aLetter$ using some tool like this. A real historical example for Frequency analysis is VENOVA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has X distribution, The two character($c_1 \oplus c_2) with probability P are c1, c2.

There are two methods, named statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute frequencies for $aLetter \oplus aLetter$ using some tool like this. A real historical example for frequency analysis is the VENOVA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has distribution $X$, the two characters behind $c_1 \oplus c_2$ with probability $P$ are $c_1$, $c_2$.

There are tow methods naming statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute Frequency for $aLetter \oplus aLetter$ using some tool like this. A real historical example for Frequency analysis is VENOVA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has X distribution, The two character($c_1 \oplus c_2) with probability P are c1, c2.

There are two methods, named statistical analysis or Frequency analysis and pattern matching.
Note that in statistical analysis Eve should compute Frequency for $aLetter \oplus aLetter$ using some tool like this. A real historical example for Frequency analysis is VENOVA project.

EDIT: Having statistical analysis of $aLetter \oplus aLetter$ like this says:
If a character has X distribution, The two character($c_1 \oplus c_2) with probability P are c1, c2.