Extracted from Pike v7.8 release 866 at 2016-11-06.
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Crypto
Crypto.Substitution

Methods
 decrypt()
 encrypt()
 filter()
 set_ACA_K1_key()
 set_ACA_K2_key()
 set_ACA_K3_key()
 set_ACA_K4_key()
 set_key()
 set_null_chars()
 set_rot_key()
previousCrypto.Substitution()->set_ACA_K3_key()
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Method Crypto.Substitution()->set_ACA_K4_key()

Method set_ACA_K4_key

this_program set_ACA_K4_key(string key1, string key2, void|int offset, void|array(string) alphabet)

Description

Sets the key according to ACA K4 key generation. Both the plaintext and the cryptogram alphabets are prepended with the keywords key1 and key2 . The plaintext alphabet is then rotated offset number of steps.