Data commit

Task/Substitution-cipher/D/substitution-cipher.d

@@ -0,0 +1,30 @@
+import std.stdio;
+import std.string;
+import std.traits;
+
+string text =
+`Here we have to do is there will be a input/source
+ file in which we are going to Encrypt the file by replacing every
+ upper/lower case alphabets of the source file with another
+ predetermined upper/lower case alphabets or symbols and save
+ it into another output/encrypted file and then again convert
+ that output/encrypted file into original/decrypted file. This
+ type of Encryption/Decryption scheme is often called a
+ Substitution Cipher.`;
+
+void main() {
+    auto enc = encode(text);
+    writeln("Encoded: ", enc);
+    writeln;
+    writeln("Decoded: ", decode(enc));
+}
+
+enum FORWARD = "A~B!C@D#E$F%G^H&I*J(K)L+M=N[O]P{Q}R<S>T/U?V:W;X.Y,Z a\tbcdefghijkl\nmnopqrstuvwxyz";
+auto encode(string input) {
+    return tr(input, FORWARD, REVERSE);
+}
+
+enum REVERSE = "VsciBjedgrzy\nHalvXZKtUP um\tGf?I/w>J<x.q,OC:F;R{A]p}n[D+h=Q)W(o*b&L^k%E$S#Y@M!T~N";
+auto decode(string input) {
+    return tr(input, REVERSE, FORWARD);
+}