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 1d awarded Enthusiast Apr 28 awarded Nice Question Apr 27 comment How solid is this method of encryption? Requests for analysis of amateur cryptographic schemes are off-topic here, so expect the question to be closed (no hard feelings). Also, while I cannot point out any specific problem with this approach, I am pretty sure it isn't secure. Good references for your further research include how to publish a cipher concept and lessons learned and common misconceptions about cryptography. Apr 27 accepted Practical differences between circuits and turing machines for cryptography Apr 27 awarded Yearling Apr 26 asked Practical differences between circuits and turing machines for cryptography Apr 22 comment How secure is this logarithmic encryption algorithm? Semi-Related: How to publish a cipher (concept) has a number of hints on what to do if you want to design and evaluate your own ciphers. Apr 21 comment GCM: use the same key:IV pair to encrypt file and filename You could derive the new IV from the old one (e.g. by hashing, using a KBKDF, ...) and still be safe, it only matters that they are different. That way, you would not have to save two different IVs. Apr 15 awarded Quorum Mar 29 comment I homebrewed an algorithm. Is it secure? See How to publish a cipher for some pointers on what to do when developing your own ciphers, it has some good pointers. Mar 29 asked Finding missing probabilities for formal proofs Mar 28 revised DES: Computing the output of S-Box 1? Formatting Mar 28 revised Why is padded RSA not CCA-secure? add CCA tag Mar 28 suggested approved edit on Why is padded RSA not CCA-secure? Mar 28 reviewed No Action Needed Can I open a file in plaintext (already decrypt) but the cipher doesn't change? Mar 28 reviewed Reviewed DES: Computing the output of S-Box 1? Mar 28 suggested approved edit on DES: Computing the output of S-Box 1? Mar 28 reviewed Reviewed multiplicative inverse in galois field $2^8$ Mar 28 reviewed Reviewed Why is CRC said to be linear? Mar 28 suggested rejected edit on Authenticated encryption with Enc-Sign-Mac